On I-65 south of Birmingham, AL, there is a very long stretch where it is impossible to get off the highway. Ends at Clanton. 18-wheeler wrecked there, closed down southbound I-65 entirely. In our cage we got caught in a walking-speed backup for two-and-a-half hours. Ambient temperature high 80s, maybe low 90s. Got to wondering if an air-cooled motorcycle engine would overheat in that situation. Any thoughts?